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Receivables And Other Current Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs Capitalized Prepaid Expense and Other Assets, Current [Abstract]    
Customer accounts receivable   $ 985
Other   42
Capitalized transportation capacity $ 89 190
Prepaid expenses 59 57
Due From Related Parties 5 16
Net investment in direct financing lease 8 8
Income Taxes Receivable, Current 24 33
Other 0 5
Receivables and other current assets $ 1,326 $ 1,323